Upload Campaign Contact List

curl --request POST \
  --url https://prod-api.ringg.ai/ca/api/v0/campaign/save \
  --header 'Content-Type: multipart/form-data' \
  --header 'X-API-KEY: <x-api-key>' \
  --form 'variables_map=<string>' \
  --form 'agent_id=<string>' \
  --form 'call_config=<string>' \
  --form 'country_code=<string>' \
  --form campaign_start_time=2023-11-07T05:31:56Z \
  --form campaign_end_time=2023-11-07T05:31:56Z \
  --form 'campaign_name=<string>'

{
  "message": "Campaign contact list uploaded successfully."
}